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Energy-saving but efficient OLEDs (Organic Light Emitting Diode) are in the process of making a strong breakthrough to the lighting, screen and display markets and more and more new, potential applications are developed constantly. Due to the OLEDs' moisture and oxygen sensitive materials, however, efficient encapsulation against ambient conditions is needed. ALD offers a reliable, simple and cost-effective way to deposit always compact, conformal, uniform and pinhole- and crack-free moisture/oxygen barrier layers on OLED components, thus ensuring their reliable operation and extended lifetime. In addition to OLEDs, ALD has several applications also in other fields of lighting technology and industries.